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A. G. & B. F. POLHEMUS,

STEAM DRAFT REGULATOR.

No. 247,404. Patented Sept. 20,1881.

N. PETERS. PhoYo-Lilhogmpher. Washingmm D. c,

.UNITED STATES PATENT OFFICE.

ABRAM Gr. POLHEMUS ANDBENJAMIN F. POLHEMUS, OF BROOKLYN, N.Y.

STEAM-DRAFT REGULATOR.

SPECIFICATION formingpart of Letters Patent No. 247,404, dated September 20, 1881.

Application filed July 21, 1881. (No model.) i

To all whom tt may concern:

4 Be it known that we, ABRAM G. POLHEMUS and BENJAMIN F. PoLHEMUs, of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Steam-Draft Regulators, of which the following'is a specification.

The object of our invention is to provide an improved construction of adjustable draft-nozzles, such as are sometimes used for discharging and regulating the discharge of a conical or outward-flaring jet of steam in the smokestack or chimney of an engine-boiler, thereby producing increased draft and more rapid con1- bustion, resulting in greater speed of the engine. It is intended to be used more especially for low-pressure marine engines, (in which the exhaust-steam is condensed, and thus cannot be utilized to promote the draft in the chimney,) and to operate with live steam admitted through a separate pipe from the boiler.

The invention consists in the construction and combination of the steam-draft nozzle and the means for adjusting the same, as will be hereinafter described and claimed.

In the accompanyingdrawings, Figure 1 represents a vertical central section of our improved steam-draft regulator. Fig. 2 is a side 'view of the same, the adjusting hand-wheel being shown in section. Fig. 3 is a horizontal section of the same, taken on the line as w of Fig. 2.

Likeletters of referenceindicate like parts in the several figures.

The nozzle consists of an inner stationary part, A, and an outer movable part, B. The inner part, A, has a hollow cylindrical shank, a,threaded inside and outside, as shown in Fig. 1, the inner thread adapting it to be screwed on the upturned threaded end of the pipe 0, (by which latter the steam is admitted from the boiler,) and the outer thread serving to re- .ceive the internally-threaded hollow shank b of the outer part, B, in order to enable this to be raised and lowered at will by turning it upon the shank a of the inner part, A. Both parts A and B have hollow conical nozzleheads a and b, widening upward from their respective shanks a and b, the head a having a closed crown or top, 0, and being provided with side openings or perforations, 61, through which steam can freely enter the head I), and the said head I) having an open crown, e, of faced upward-widening conical opening, surrounding the inner crown, c. The upward-widening conical circumference of the inner crown,

o, is also faced smooth, and is formed of a more obtuse cone than the opening in the crown e, and also projects suffieiently beyond the latter to slightly exceed its diameter, so that by turning the outer part, B, to raise or lower it slightly upon the stationary part A the opening at f may be varied in size or entirely closed, as may be desired. The crown 0 ofthe inner part, A, has a flat-sided projection, g, and the lower end of the shank a is similarly faced oh" at g to allow of its being screwed down and fastened upon the pipe 0 by means of a screwwrench. The downward-turnin g movement of the outer part, B, is limited by the adjusted nut-ring l), which also may be used as ajam-nut to retain the said part for some time permanent in a certain position, should it so be desired.

In order to manipulate the adjustment of the draft-regulator conveniently at any suitable place located some distance from the smokestack the following mechanism is provided:

On the outer circumference of the internallythreaded shank b is formed or attached acogring, E, and a toothed rack, F, is arranged to mesh with the said cog-ring. The rack F may be kept in gear by any suitable guide-support; but we prefer the simple device shown in the drawings, in which the rack is fitted to slide in a guiding-bail, H, with its three smooth sides in contact with the said guide, which latter keeps the teeth in gear by pressure on the back of the rack at two or more points,pp, distanced apart enough to preventthebailfrom turning slightly with the movement of the rack, and thus binding and impeding such movement. The bail H has two semicircular straps, h, embracing the shank b, and fitted in circumferential grooves 8 above and below the cog-rin g E sufiiciently loosely to allow the shank b to turn in the straps h when the rack F is slid backward or forward. The bail, in order to attachit with the straps in the grooves s, is madein two parts, bolted together at h and hinged or bolted together at [L2, as shown in Fig. 3.

The near end, G, of the rack F is round and threaded to fit in the bored and threaded hub of a hand-wheel, I. This hub has a circular base-flange, i, which is held in position to be turned within two or more overlapping cleats, K, secured to a suitable support, J, through which the end G passes centrally between said cleats.

It is self-evident that by turning the handwheel I the rack can be slid to turn the movable part B upon the stationary part A, and thus the size of nozzle-opening at f can be adjusted to any nicety required.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. In a steam-draft regulator, the stationary inner part, A, secured upon the steam-pipe O, and having a hollow cylindrical externallythreaded shank, a, and inverted. conical head a, said head being provided with steam-apertures d and closed crown c, in combination with the movable outer part, B, having closed cone head I) and open crown 6, said outer part, B, being provided with internally-threaded shank b, fitted to turn upon the threads of the inner shank, a, to adjust the size of the nozzle-opening, substantially as specified.

2. In a steam-draft regulator, the outer part, B, movable upon the inner stationary part, A, constructed substantially as shown and described, and provided with the cog-ring E, in combination with the operating -rack, F, arranged to slide in gearing contact with the said cog-ring, substantially as and for the purpose set forth.

3. In a steam-draft regulator, the outer part, B, movable upon the inner stationary part, A, and provided with the cog-ring E and circumferential grooves 8 above and below said cogring, in combination with the rack F and with the guiding-bail H, provided with semicircular straps h, fitted in the said grooves, said bail being clamped around the shank b, substantially as specified.

4. In combination with the rack F, having a threaded end, G, and fitted to slide in gearing contact with the circumferentially-tootlied shank of the outer movable part, B, of the nozzle, the hand-wheel I, having circular base flanget' upon its bored and threaded hub, and the cleats K, overlapping the said flan ge-and secured to a suitable support, J, substantially as and for the purpose set forth.

ABRAM G. POLHEMUS. BENJAMIN F. POLHEMUS.

Witnesses:

ALEX. F. ROBERTS, J OIIN M. STELLE. 

